When I watch an amazing movie, I love to re-watch it with director's commentary. I find that there is so much insight that you can reflect on when you hear what went into making the film.
Have you seen Bad Words? It just came out on Red Box and it's amazing. Sooooooo funny :) Not a lot of movies still have great bonus features but this one does :) I highly recommend watching it first without commentary, then again with it. Jason Bateman is hilarious ;)
Another great director's commentary is You've Got Mail.
